When there are empty lines at the top of the content and text is pasted at the first line, it appears after the empty rows not where the cursor position is.

Steps to reproduce:
1. Go to http://demos.telerik.com/aspnet-ajax/controls/examples/integration/ribbonbarandeditor/defaultcs.aspx?product=editor
2. Put focus in the editor before any of the existing content.
3. Press enter several times to insert blank lines at the top of the content.
4. Paste some text at the first line.

Expected: The pasted text is inserted at the first line of the content area.
Actual: The pasted text is placed after the empty lines.